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Influence of Sublaminate Cracks on the Tension Fatigue Behavior of a Graphite/Epoxy Laminate
L. Carlsson
C. Eidefeldt
T. Mohlin
出版
ASTM International
, 1986
URL
http://books.google.com.hk/books?id=5Ph9zgEACAAJ&hl=&source=gbs_api
註釋
Quasi-isotropic 32-ply graphite/epoxy specimens were tested in static tension and tension fatigue. Both dry specimens and specimens containing 1% moisture (by weight) were tested. The first type of damage observed under both static and cyclic loading was transverse matrix cracking in the 90-deg plies. Under continued static or cyclic loading the cracks propagated into the neighboring -45-deg plies. No delamination was observed under static loading. In fatigue the matrix cracks acted as initiators of delamination, which resulted in a marked reduction in stiffness and residual strength. For specimens which had been subjected to a tensile overload before fatigue cycling, delamination occurred earlier due to the formation of more transverse matrix cracks.
